Change of supplier status

Question:
We have a problem of re-purchase of a supplier firm.

Answer:
If the supplier changes the name, it's normal and desirable that all the SDS to be updated (new contact of supplier other than the creation of new SDS). We don't achieve the history of supplier and its changes since the legal responsibility remains the same after changing its name.
On the contrary, if the supplier is re-purchased by another group, it's logical to create a new SDS because the legal liability is transferred to the new entity even physically it's the same plant.